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Stock-Based Compensation Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Stock based compensation plans:
Stock-based compensation expense	$ 2,300	$ 2,500	$ 9,200	$ 7,800
Tax benefits from stock-based compensation expense	$ 600	$ 600	$ 2,300	$ 1,900
Grants in period, options (in shares)			0	0
Restricted stock
Stock based compensation plans:
Grants in period, other than options (in shares)			3,069	379,852
Performance and market-based stock
Stock based compensation plans:
Grants in period, other than options (in shares)			139,191	105,543
Restricted Stock Units (RSUs) [Member]
Stock based compensation plans:
Restricted stock units granted to various employees			381,759		0